Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Which Inductor for (First Order) woofer low pass??
Which Inductor for (First Order) woofer low pass??
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th June 2019, 11:55 PM   #31
Wikkid is offline Wikkid  United States
diyAudio Member
 
Wikkid's Avatar
 
Join Date: Apr 2005
Location: South Florida
Quote:
Originally Posted by ICG View Post
If you don't like my help or me posting here, I'll stop. Do you?
Alright then..
Perhaps we got off on the wrong foot....
I see that you are sincerely trying to help.

So what exactly are you proposing?
  Reply With Quote
Old 20th June 2019, 09:17 AM   #32
ICG is online now ICG  Germany
diyAudio Member
 
ICG's Avatar
 
Join Date: Jul 2007
Location: I had a Déjà Moo - I've seen that BS before!
Quote:
Originally Posted by Wikkid View Post
So what exactly are you proposing?
To go passive, you need a much higher Qts so it reaches the level of the Supravox. Since you don't want that, there are only two things as solution.

1. Use more 15" drivers in the sub range and push the Qt slightly, likely 18dB crossover. A 2nd 15" would give you +3dB by double the cone area and +3dB because the halved impedance doubles the power drawn from the amplifier. You mentioned a tube amp. I don't know if the amp would be happy about the lower impedance. Also, the coils would get much more expensive since lower (half) impedance means double the inductance and for 18dB you need two per side. The DCR of the coils will rise the Qt but added DCR ofcourse decreases the spl. A lot of compromises and 'IF's.

2. You stay at an active solution, preferable with a dsp. That would solve all your problems and still be cheaper.
__________________
I had a Déjà Moo - I've seen that BS before!
  Reply With Quote
Old 20th June 2019, 10:28 AM   #33
picowallspeaker is offline picowallspeaker  Italy
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Quote:
Originally Posted by ICG View Post
Also, the coils would get much more expensive since lower (half) impedance means double the inductance
A-hem..!
__________________
Everything under and above heaven is in utter chaos
mare monstrum
  Reply With Quote
Old 20th June 2019, 10:36 AM   #34
ICG is online now ICG  Germany
diyAudio Member
 
ICG's Avatar
 
Join Date: Jul 2007
Location: I had a Déjà Moo - I've seen that BS before!
Quote:
Originally Posted by picowallspeaker View Post
A-hem..!
Good catch. Thank you, ofcourse it's the other way around. I was writing about twice as much coils costing ~twice as much than 6dB and was editing while writing and obviously went braindead while doing so. Sry.
__________________
I had a Déjà Moo - I've seen that BS before!
  Reply With Quote
Old 20th June 2019, 01:00 PM   #35
tsmith1315 is offline tsmith1315  United States
diyAudio Member
 
tsmith1315's Avatar
 
Join Date: Jul 2003
Location: Doerun, GA
Quote:
Originally Posted by denibeni View Post
In response to the original question, I think it is almost irrelevant which inductor you would choose.
It is irrelevant, because the level of precision and accuracy that the OP is basing his decision on won't happen in a single-element passive filter operating this close to fs

This is why ICG suggested an active filter in post #19, to test and see if 1st order would be satisfactory before attempting to design a passive implementation.

All IMHO, this is.
__________________
Tim
  Reply With Quote
Old 20th June 2019, 01:22 PM   #36
denibeni is offline denibeni  Europe
diyAudio Member
 
Join Date: Nov 2013
Quote:
Originally Posted by tsmith1315 View Post
It is irrelevant, because the level of precision and accuracy that the OP is basing his decision on won't happen in a single-element passive filter operating this close to fs

This is why ICG suggested an active filter in post #19, to test and see if 1st order would be satisfactory before attempting to design a passive implementation.

All IMHO, this is.
Well said, but needs to consider that a 1st order active filter is usually not equal to single element passive filter. Mainly due to the variable impedance of the driver.

Last edited by denibeni; 20th June 2019 at 01:32 PM.
  Reply With Quote
Old 20th June 2019, 01:58 PM   #37
Mrcloc is offline Mrcloc  South Africa
diyAudio Member
 
Join Date: May 2016
Location: Pretoria
Quote:
Originally Posted by Wikkid View Post
That is actually helpful! Thank you!

Fixed.


Right. I'm reading this thread as a technical exercise to learn a bit more. I think ICG and OP have a slight misunderstanding. I believe OP wants to level the FR, not cut it after 70/75 Hz.


Click the image to open in full size.


Attached Images
File Type: png Level.png (3.0 KB, 29 views)
  Reply With Quote
Old 20th June 2019, 02:00 PM   #38
tsmith1315 is offline tsmith1315  United States
diyAudio Member
 
tsmith1315's Avatar
 
Join Date: Jul 2003
Location: Doerun, GA
Right you are denibeni, thus the embedded "attempting to design" disclaimer.

Mrcloc, the OP indicated 70-75Hz low pass filter in the first post.
__________________
Tim

Last edited by tsmith1315; 20th June 2019 at 02:29 PM.
  Reply With Quote

Reply


Which Inductor for (First Order) woofer low pass??Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Simplest 1st order high pass and low pass filter LeBurgh Analog Line Level 2 10th January 2017 09:46 AM
Help with Tweeter Inductor value for 2nd order L/riley mart.s Multi-Way 1 14th December 2008 03:56 AM
2nd Order Tweeter + 3rd Order Woofer = OK? Jay Multi-Way 3 12th September 2005 12:12 PM
1st Order Tweeter, 3rd Order Woofer? Jay Multi-Way 8 8th May 2004 09:29 PM
X-BOSOZ 1st order inductor filter Ignatz Pass Labs 14 17th April 2003 10:01 PM


New To Site? Need Help?

All times are GMT. The time now is 06:13 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki